One night and two days of 1 night and left alone by my wife's sister who suddenly came over

"Oh, sister-in-law!?" While my wife was pregnant and went back to her hometown, my wife's sister, Kasumi, came to check on her, thinking that Tatsuya might be in trouble. Even though it's been a while since he's lived alone, Tatsuya, who is fed up with the lonely life, happily leaves Kasumi at home... "Hey, isn't it piling up?" Suddenly, Kasumi burst into the bath and her big breasts are pressed against her, and her whole body is washed all over.